So. I've heard a bit about this secret bathroom, and I'd never gotten around to asking where it is.
I thought I'd be clever and figure it out myself by thinking of all the bathrooms I know and then looking at the map, but it didn't work! I can't think of a single bathroom that I know of that's not on the map. Maybe I just don't go to the bathroom enough?
So I went to the Happiest Potties on Earth site at Mouseplanet and compared it with my map. http://www.mouseplanet.com/potties/summary.html
The unmarked (well, not on the map at least) bathrooms I found were:
Behind the AAA Kiosk to the left of City Hall
On the porch of the Plaza Pavilion (near an also unmarked smoking area)
Big Thunder Ranch area (Ranch was still closed at the time I got this map, maybe that's why unmarked? or have they been closed since the BBQ closed?)
Tiki Room bathrooms
Aladdin's Oasis (only available during shows anyway)
Indian Jones queue restroom (by permission only)
Blue Bayou and Club 33 bathrooms also not on map, obviously.
Which one of these is actually considered "the secret one" that is mentioned here so much?
Also, the bathrooms between Frontierland and the Plaza Gardens stage are on the map but weren't on this MP list; are they new since it's been written?